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HelloI want to update one field of one record using linq. I use below codeDim p1 = (From p In db.Products_ Where p.ProductID= 1320 _ Select p).Single p1.CategoryID= p1.CategoryID+ 1 db.SubmitChanges()The issue is above query first execute select command and then Update command. and then update all fields of selected record. and this cause overflow to DB.I need to only update one field value. How Coudl I get below sql command. (only update one field)update Productsset CategoryID= CategoryID+ 1where ProductID=1320

Hi All..
My problem is i am working on Linq,as we know to use any table in linq we have to drag and drop it on our datacontext's Designer File,and at run time we got its value,till here no any problem,main point is if any changes in respective data source's schema has made ,then on datacontext we will not get that changes,for it we have to change this datacontext manually by by again drag and drop,it will not happen implicitly when this changes has been made on the data source.
so please tell me how i solve this problem so that datacontext change implicitly without any over head using .net 3.5 .

Hi,
not sure if I'm posting this thread in the right section. anyway, I''m trying to do the update/insert/delete using LINQ but the underlying table does not a primary key. The table consists of composite ket (e.g. fieldA & FieldB make a primary key).
At the moment, I have LINQ complaning about not having a single primary key (not sure what LINQ does it - not making any sense at all).
did anyone ever come across this issue and rectified it?
thanks

In the code below, the For Each will loop through the list and populate the ListBox. When I add "item.LeadTime = 5" to try updating an item, Visual Studio says that it is ReadOnly. Any ideas on what's wrong or missing from the code?
Dim spWebUrl As String = SPContext.Current.Web.Url
Dim dc As New MyDataContext(spWebUrl)
Dim Asgns = From a In dc.GetList(Of AssignmentsItem)("Assignments") Select a.LeadTime, a.Frequency
For Each item In Asgns
ListBox1.Items.Add(item.Frequency)
item.LeadTime = 5
dc.SubmitChanges()
Next

Hi, I'm stumbling along trying my hand at Linq to SQL and have come across this code below that was provided by MS.http://msdn.microsoft.com/en-us/vbasic/bb737928.aspxThe problem is there is no ".add" method for Categories to chose in the statement db2.Categories.add(newCategory)I've seen similar videos here on ASP .NET that uses code very much like the example below, but I am unable to run this example connected to a Northwind SQL database using Web Developer 2010 Express. This is the One-to-Many example listed under Linq To SQL Samples - Insert/Update/Delete. Thanks for any help! Shawn Dim db2 = New DataClassesDataContext
Dim ds = New DataLoadOptions()
ds.LoadWith(Of Category)(Function(p) p.Products)
db2.LoadOptions = ds
Dim newCategory = New Category With {.CategoryName = "Widgets", _
.Description = "Widgets are the customer-facing analogues " & _
"to sprockets and cogs.", _
.Picture = Nothing}
Dim newProduct = New Product With {.ProductName = "Blue Widget", _
.UnitPrice = 34.56#, _
.Category = newCategory, _

If I make a change to my database (let's say I add a column to a table), is there any magical buttons that I can click to have my Linq to SQL model update to reflect the changes to my table? I had to create two additional columns yesterday, and both times I found myself destroying and then recreating the Linq model.

One of its features is grouping. Many people understand grouping like it is defined in Sql. Linq is implementing grouping quite the same way. Let's discover this syntax and how to make consecutive groups easier.

101 LINQ Example with sample code snippets....This sample prints each element of an input integer array whose value is less than 5. The sample uses a query expression to create a new sequence of integers and then iterates over each element in the sequence, printing its value

When using Linq to objects, you will quickly feel the need to pass some parameters from a method to another but it's not so easy because each Linq method is not calling the following one. In a Linq sequence, each method is using the result computed by the previous one. So, local contexts are not visible from one method to another. The compiler is using two technical different ways to let parameters go out of a method.

In ASP.Net 2.0, GridView Control also provides the functionality to edit and update the data retrieved from the database using CommandField template. You can cancel the action using Cancel Command of the CommandField. GridView consists of events that can be used to perform the actions like edit, update and cancel upon the Data items displayed in the ASP.Net GridView Data Control.